The USC Libraries' Developing Keywords tutorial can help you practice using the most effective search terms so a database can find just what you seek.
Subject indexes in ProQuest are available under Advanced Search. An available thesaurus or index is listed with the database.
Web-based citation managers that allow you to import references from text files, web sites or online databases. From more information on Citing styles, visit the Citation Guide
Type in your information and have a citation compiled for you. Note that these are not foolproof systems so it is important that you verify that your citation is correct and check your spelling, capitalization, etc. However, they can be useful in creating basic types of citations, particularly for online sources.